# List of law firms in Ontario Tamtam tracks 30 law firms headquartered in Ontario. This list ranks all of them by number of employees on LinkedIn, led by KPMG Canada, Fasken and Borden Ladner Gervais LLP (BLG). Their median headcount is 807. Half of them were founded in 1920 or later. The most common headquarters are Toronto (25), London (2) and Ottawa (2). These Ontario-based firms are primarily large law practices, with one financial services firm and one software development company also present. Notable examples include Fasken, an international law firm with over 950 lawyers, and Borden Ladner Gervais LLP, a Canadian law firm offering bilingual services. McCarthy TΓ©trault provides a wide range of legal services to Canadian and international clients, while Osler, Hoskin & Harcourt LLP advises on business law. A clear pattern among these companies is their strong concentration in Toronto, which serves as the headquarters for all listed firms. Many of these law firms also have long histories, with Borden Ladner Gervais LLP founded in 1823, McCarthy TΓ©trault in 1855, and Blake, Cassels & Graydon LLP in 1856, indicating a well-established legal sector. πŸ‡¨πŸ‡¦ Ontario Β· 30 companies Β· Updated Nov 12, 2026 | # | Company | Industry | Headquarters | Employees | Founded | |---|---|---|---|---|---| | 1 | [KPMG Canada](https://www.tamtam.ai/c/kpmg-canada) (kpmg.com)
Providing audit, tax, and advisory services to public, private, nonprofit, and public sector organizations across Canada with professionalism. | Financial Services | πŸ‡¨πŸ‡¦ Toronto | 10,017 | | | 2 | [Fasken](https://www.tamtam.ai/c/fasken) (fasken.com)
An international law firm with over 950 lawyers and offices on three continents, providing practical legal services for complex business and litigation challenges | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 2,458 | | | 3 | [Borden Ladner Gervais LLP (BLG)](https://www.tamtam.ai/c/borden-ladner-gervais-llp-blg) (blg.com)
A Canadian law firm offering bilingual services in common and civil law, with a national presence and global reach through an international network Contributing to communities through pro bono work and charitable initiatives | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 2,290 | 1823 | | 4 | [McCarthy TΓ©trault](https://www.tamtam.ai/c/mccarthy-tetrault) (mccarthy.ca)
Canadian-based law firm offering a wide range of legal services to Canadian and international clients, with expertise in business law, litigation, tax, real estate, and labor law | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 2,088 | 1855 | | 5 | [Osler, Hoskin & Harcourt LLP](https://www.tamtam.ai/c/osler-hoskin-and-harcourt-llp) (osler.com)
providing business law advice and counsel to Canadian, U.S., and international clients on domestic and cross-border legal issues | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 1,707 | 1862 | | 6 | [Blake, Cassels & Graydon LLP](https://www.tamtam.ai/c/blake-cassels-and-graydon-llp) (blakes.com)
A top Canadian business law firm providing exceptional legal services to leading businesses in Canada and globally, with a focus on client relationships and expertise | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 1,686 | 1856 | | 7 | [Gowling WLG Canada](https://www.tamtam.ai/c/gowling-wlg-canada) (gowlingwlg.com)
International legal organization formed through the merger of a Canadian and UK-based law firm, offering specialized legal services across 18 global locations | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 1,572 | | | 8 | [Stikeman Elliott LLP](https://www.tamtam.ai/c/stikeman-elliott-llp) (stikeman.com)
A global leader in Canadian business law, providing legal services and creative solutions in various practice areas to clients worldwide | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 1,564 | 1952 | | 9 | [Miller Thomson LLP](https://www.tamtam.ai/c/miller-thomson-llp) (millerthomson.com)
National business law firm with 525 lawyers in Canada offering litigation, mergers and acquisitions, corporate finance, tax, real estate, labor & employment services | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 1,415 | 1957 | | 10 | [Torys LLP](https://www.tamtam.ai/c/torys-llp) (torys.com)
Providing superior counsel and client service, our cross-border team offers innovative solutions for clients' toughest problems with regional expertise | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 1,106 | 1941 | | 11 | [Legal Aid Ontario](https://www.tamtam.ai/c/legal-aid-ontario) (legalaid.on.ca)
Legal Aid Ontario provides high-quality legal services to low-income individuals, including advice, duty counsel representation, and funding for complex cases | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 1,063 | | | 12 | [Dye & Durham Corporation](https://www.tamtam.ai/c/dye-and-durham-corporation) (dyedurham.com)
Provider of practice management solutions for legal professionals, data insights for corporate transactions, and payments infrastructure for government and financial institutions across multiple countries | Software Development | πŸ‡¨πŸ‡¦ Toronto | 945 | | | 13 | [McMillan LLP](https://www.tamtam.ai/c/mcmillan-llp) (mcmillan.ca)
A national business law firm in Canada specializing in transportation, technology, infrastructure, natural resources, energy, cross-border transactions, private equity, real estate, and regulatory disputes | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 935 | 1903 | | 14 | [Cassels Brock & Blackwell LLP](https://www.tamtam.ai/c/cassels-brock-and-blackwell-llp) (cassels.com)
A leading Canadian law practice specializing in business law, serving clients ranging from start-ups to multinational corporations with practical and flexible legal solutions | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 874 | 1888 | | 15 | [Davies Ward Phillips & Vineberg LLP](https://www.tamtam.ai/c/davies-ward-phillips-and-vineberg-llp) (dwpv.com)
A leading Canadian business law firm specializing in high-stakes matters, providing clarity, speed, and effective solutions for complex deals and cases Offices in Toronto, MontrΓ©al, and New York | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 807 | | | 16 | [Law Society of Ontario](https://www.tamtam.ai/c/law-society-of-ontario) (lso.ca)
Regulating, licensing, and disciplining lawyers and paralegals in Ontario to ensure high standards of learning, competence, and professional conduct | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 788 | 1797 | | 17 | [Aird & Berlis LLP](https://www.tamtam.ai/c/aird-and-berlis-llp) (airdberlis.com)
Legal counsel with a business perspective for clients conducting business in Canada or abroad, with strong relationships and expertise in various industries | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 643 | 1919 | | 18 | [Goodmans LLP](https://www.tamtam.ai/c/goodmans-llp) (goodmans.ca)
A leading Canadian law firm with expertise in business law, litigation, public/private sectors, providing innovative solutions for clients' success | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 520 | | | 19 | [Smart & Biggar](https://www.tamtam.ai/c/smart-and-biggar) (smartbiggar.ca)
Leading Canadian firm specializing in intellectual property law with a team of over 100 lawyers, patent agents, and trademark agents providing top-quality advisory services and successful IP litigation outcomes | Law Practice | πŸ‡¨πŸ‡¦ Ottawa | 505 | 1890 | | 20 | [Canadian Medical Protective Association](https://www.tamtam.ai/c/canadian-medical-protective-association) (cmpa-acpm.ca)
A leading provider of medical liability protection and professional development for Canadian physicians, offering risk management education and legal advice | Hospitals and Health Care | πŸ‡¨πŸ‡¦ Ottawa | 481 | 1901 | | 21 | [Lerners LLP](https://www.tamtam.ai/c/lerners-llp) (lerners.ca)
Law firm with over 100 lawyers offering expertise in various practice areas, known for handling complex cases, creating new law, and delivering positive outcomes for clients | Law Practice | πŸ‡¨πŸ‡¦ London | 464 | 1929 | | 22 | [Blaney McMurtry LLP](https://www.tamtam.ai/c/blaney-mcmurtry-llp) (blaney.com)
A premier law firm in Toronto's financial district, specializing in litigation, real estate, and business law with a focus on delivering efficient and practical legal services | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 327 | 1954 | | 23 | [Tribunals Ontario I Tribunaux dΓ©cisionnels Ontario](https://www.tamtam.ai/c/tribunals-ontario-i-tribunaux-decisionnels-ontario) (tribunalsontario.ca)
Group of 13 adjudicative tribunals in Ontario providing fair and accessible dispute resolution to thousands of Ontarians, resolving nearly 100,000 cases per year | Government Administration | πŸ‡¨πŸ‡¦ Toronto | 284 | 2019 | | 24 | [LexisNexis Canada](https://www.tamtam.ai/c/lexisnexis-canada) (lexisnexis.com)
Leading global provider of information and technology solutions for legal, corporate, tax, and government professionals, focusing on innovation, comprehensive content, and workflow efficiency | IT Services and IT Consulting | πŸ‡¨πŸ‡¦ Toronto | 225 | | | 25 | [Green and Spiegel](https://www.tamtam.ai/c/green-and-spiegel) (gands.com)
A boutique immigration law firm with offices in multiple locations, specializing in all categories of North American immigration law for over 40 years | Legal Services | πŸ‡¨πŸ‡¦ Toronto | 222 | 1962 | | 26 | [Gardiner Roberts LLP](https://www.tamtam.ai/c/gardiner-roberts-llp) (grllp.com)
Established in the 1920s, we are a mid-sized law firm serving diverse clients including banks, municipalities, tech companies, and real estate developers | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 213 | 1920 | | 27 | [Harrison Pensa LLP](https://www.tamtam.ai/c/harrison-pensa-llp) (harrisonpensa.com)
A full-service law firm based in London, Ontario, specializing in litigation, business law, real estate, family, wills and estates, and personal injury law | Law Practice | πŸ‡¨πŸ‡¦ London | 181 | 1999 | | 28 | [Fraser Milner Casgrain LLP](https://www.tamtam.ai/c/fraser-milner-casgrain-llp) (dentons.com)
A global law firm formed by the merger of Salans LLP, Fraser Milner Casgrain LLP, and SNR Denton, focused on providing clients a competitive edge worldwide | Law Practice | πŸ‡¨πŸ‡¦ Toronto | 181 | 1839 | | 29 | [Chodola Reynolds Binder](https://www.tamtam.ai/c/chodola-reynolds-binder) (crblaw.ca)
A law firm in Windsor, Canada since 1973, specializing in civil litigation, insurance defense, real estate, and corporate law with a reputation for excellence and integrity | Law Practice | πŸ‡¨πŸ‡¦ Windsor | 7 | 1973 | | 30 | [CiteRight](https://www.tamtam.ai/c/citeright) (citeright.net)
AI-powered Knowledge Management tool for lawyers, automating citations and document drafting to save time and reduce errors in litigation workflows | Legal Services | πŸ‡¨πŸ‡¦ Toronto | 4 | 2017 | ## How this list is built Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026. ## More company lists in Ontario - [The largest companies in Ontario](https://www.tamtam.ai/l/largest-companies-ontario) (5,032) - [Multinational companies in Ontario](https://www.tamtam.ai/l/multinational-companies-ontario) (901) - [Financial services firms in Ontario](https://www.tamtam.ai/l/financial-services-firms-ontario) (396) - [Manufacturers in Ontario](https://www.tamtam.ai/l/manufacturers-ontario) (389) - [Critical infrastructure operators in Ontario](https://www.tamtam.ai/l/critical-infrastructure-operators-ontario) (344) - [Retail chains in Ontario](https://www.tamtam.ai/l/retail-chains-ontario) (327) - [Companies with in-house R&D in Ontario](https://www.tamtam.ai/l/r-and-d-companies-ontario) (300) - [Logistics companies in Ontario](https://www.tamtam.ai/l/logistics-companies-ontario) (285) - [Education providers in Ontario](https://www.tamtam.ai/l/education-companies-ontario) (276) - [SaaS companies in Ontario](https://www.tamtam.ai/l/saas-companies-ontario) (275) - [Truck Transportation companies in Ontario](https://www.tamtam.ai/l/truck-transportation-companies-ontario) (270) - [Transportation, Logistics, Supply Chain and Storage companies in Ontario](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-ontario) (261) - [Public sector organisations in Ontario](https://www.tamtam.ai/l/public-sector-organisations-ontario) (259) - [Financial Services companies in Ontario](https://www.tamtam.ai/l/financial-services-companies-ontario) (250) - [IT Services and IT Consulting companies in Ontario](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-ontario) (235) - [Software Development companies in Ontario](https://www.tamtam.ai/l/software-development-companies-ontario) (231) - [Healthcare providers in Ontario](https://www.tamtam.ai/l/healthcare-providers-ontario) (226) - [Hardware manufacturers in Ontario](https://www.tamtam.ai/l/hardware-companies-ontario) (213) - [Professional services firms in Ontario](https://www.tamtam.ai/l/professional-services-firms-ontario) (211) - [Hospitals and Health Care companies in Ontario](https://www.tamtam.ai/l/hospitals-and-health-care-companies-ontario) (205) - [Distributors and wholesalers in Ontario](https://www.tamtam.ai/l/distributors-and-wholesalers-ontario) (183) - [Companies with a mobile app in Ontario](https://www.tamtam.ai/l/companies-with-mobile-app-ontario) (181) - [Publicly traded companies in Ontario](https://www.tamtam.ai/l/publicly-traded-companies-ontario) (156) - [IT services companies in Ontario](https://www.tamtam.ai/l/it-services-companies-ontario) (156) ## The same list elsewhere in Canada - [Law firms in Canada](https://www.tamtam.ai/l/law-firms-canada) (51) - [Law firms in Toronto](https://www.tamtam.ai/l/law-firms-toronto) (25) ## The same list elsewhere - [Law firms in the world](https://www.tamtam.ai/l/law-firms-in-the-world) (3,223) --- Source: https://www.tamtam.ai/l/law-firms-ontario